The perimeter of an isosceles triangle is 56 cm, and the base is 16 cm. Find the two sides of the triangle.

1. Let’s calculate what the sum of the two sides of the triangle will equal, which have equal length, if we know that this triangle is isosceles, its perimeter is 56 cm, and the length of its base is 16 cm.

56 – 16 = 40 cm.

2. We found out that the sum of two unknown sides of a given triangle is 40 cm. And since these two sides have the same length, therefore we can find out what the length of one side is.

40/2 = 20 cm.

Answer: The length of the side of the triangle is 20 cm.